Now, while I whole heartedly agree, support and share this theory(I love the concept of a shared universe more than anything), I can totally see this backfiring on Ubisoft if this is true, as, commonly when they do a shared universe, there is a common threat that puts these protagonists together. I really don't see a common threat that would make The Fox of Chicago, Aiden Pierce team up with Miles and the Assassin Brotherhood, or anything that would cause Sam Fisher to team with Aiden. Abstergo, I guess, but what could they do? It's not like they can turn into a giant lava monster.
Anyway, thanks for reading this poorly written blog, if you agree, great, if you don't that's cool too. Feel free to share your thoughts below. Have a good night, and a pleasant tomorrow! :D